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Electrospun Strontium Titanata Nanofibers Incorporated with Nickel Oxide Nanoparticles for Improved Photocatalytic Activities

The inexpensive sources of fossil fuels in the world are limited, and will deplete soon because of the huge demand on the energy and growing economies worldwide. Thus, many research activities have been focused on the non-fossil fuel based energy sources, and this will continue next few decades. Water splitting using photocatalysts is one of the major alternative energy technologies to produce hydrogen directly from water using photon energy of the sun. Numerous solid photocatalysts have been used by researchers for water splitting. In the present study, nickel oxide and strontium titanata were chosen as photocatalysts for water splitting. Poly (vinyl pyrrolidone) (PVP) was incorporated with nickel oxide [Ni2O3] (co-catalyst), while poly (vinyl acetate) (PVAc) was mixed with titanium (IV) isopropoxide [C12H28O4Ti] and strontium nitrate [Sr(NO3)2]. Then, two solutions were electrospun using coaxial electrospinning technique to generate nanoscale fibers incorporated with NiOx nanoparticles. The fibers were then heat treated at elevated temperatures for 2hr in order to transform the strontium titanata and nickel oxide into crystalline form for a better photocatalytic efficiency. The morphology of fibers was characterized via scanning electron microscopy (SEM), while the surface hydrophobicity was determined using water contact angle goniometer. The UV-vis spectrophotometer was also used to determine the band gap energy values of the nanofibers. This study may open up new possibilities to convert water into fuel directly using the novel photocatalysts. Read- DOI-

Effect of Gd3+ ion concentration on photoluminescence and thermoluminescence studies of Y4Al2O9 phosphor

The current paper reports the synthesis of Gadolinium (Gd) doped Y4Al2O9 phosphor by solid state reaction method. Powder X-beam diffraction (PXRD) tools are very much coordinated with the standard monoclinic system with space group P21/c. XRD investigation reveals that parti cles size was found in the range ∼60-70 nm. The optical (PL) and thermoluminescence (TL) behavior of Gd doped Y4Al2O9 phosphor were investigated. From the TL data of Y4Al2O9:Gd3+ nanophosphor with UV irradiation, it is observed that considerable amount of re-trapping is taking place in all the TL second order peaks. Photoluminescent spectroscopy (PL) was used to analyse luminescence properties of the prepared phosphor. The emission spectra have peaks centered at 473 nm in blue region. The process of emission mechanism is also discussed.